Telephone system.



H. NANSN.

SYSTEM A PLCOATIH FILEB MAY 29, 1907. Fi fm znte Nov. 28, 1911.

-' I r I y v L flttomwgf E, MNSONQ .TELEPHONE SYSTEM.

APPLICATION FLE-BD MAY Z9, 1907. ,@Q Faltante@ Nm', 3.9M.

l SHEETS-SHEET L RAY n. Manson, or

ELYRIA., OI-IID, ASSIGNOR TO THE DEAN ELECTRIC COMPANY, 0F

ELYRIA, OHIO, A CORPORATION 0F OHIO.

TELEPHDNE SYSTEM.

Specification of Letters Patent.

Application filed May 2S), 1907.

Patented Nov. 28. 1911. serial No. 376,419. i

To all whom t may concern: y

' Be it known that I, RAY H. MANsoN, a

citizen of the United States, residing at Elyria, in the county of Lorain and State of Chio, have invented certain new and useful. Improvements in Telephone Systems, of which the following is a specification, reference beinghad. therein to the accompanying drawing.

My invention relates to telephone systems and especially to such systems as are adapted for what is known -as measured service.

' The main object of my ihventionis in lsuch a system to arrange meters for registering theinumber of line-calls, with actuatmeans therefor located in the operators. cord circuits.

sidrable trouble has arisen because of what I may call double registering, that is to say,

a proper registratio'nof a call in the first instance, and then because of an accident or error, another registration of the same-call. Where the registration. is controlled from the subscribers station, the switch hook may accidentally move and produce lthis uncle sirable result. Where the controlling mea-ns- 'is connected to the operators cord circult,

cesslve, calls, since it would be impossible l'for the operator to obtain control of the lregister for a second time without the knowledge of the subscriber.

My invention is illustrated in the accompanying drawings, wherein#- FigureV 1 is a diagrammatic view of a B-wire cord circuit embodying my invention and one rend of a-nsubscribersline circuit provided with a meter. Figs. 2 and 3 are detail vviews of a modified form of the keylln most devices of this -type which have been heretofore in use, con- ,the same.

and locking means shown in Fig. 1. Fig. 4;

is a diagrammatic view showing one end of a cord circuit and a modified arrangement of the meter actuating devices. Figs. 5, Q and 7 are detail views showing other modications of the arrangement of the meter actuating devices. Fig. 8 shows another modification involving a polarized meter mechanism. Fig. 9 is a detail view showing the arrangement in the subscribers line crcuit of a thermally operated meter.

Referring to llig. 1, 1 and 2 denote the line wires of a subscribers line; 3 the connection between the sleeve of the jack and the winding of the cut-off relay D, the other end of the winding being in circuit through the wire 4 with the meter M. L denotesthe line relay and A the battery for actuating P and P represent the answering and calling plugs respectively of a 8- wire cord circuit. These plugs are normally -connected by way ofthe conductors 5 6 and 7-8, broken of course by the condensers C and C2. The main battery B is bridged in the cord as usual, each end of the cord being typical, the battery being connected to the tip and sleeve sides of the cord on one side of the condensers through the divided windings of the supervisory relay W by means of the conductors 9--9 and 11-11 and forming a similar bridge on the other side of the condensers through the relay S and the conductors 10--10 and 12-12. ln the third strand of the cord' are included the'supervisory control relays E and F controlling current supplied to the supervisory signal lamps e and f in the ordinary manner. There is also included in the third strand ofthe cord circuit a high resistance It, the same adapted to be shunted by-a normally open circuit 16, 19, 17, which contains a low resistance relay H and a key K adapted to close the shunt circuit at the contact 19. lt will be understood that -the key K is located in connection with the 141,15, R, G. Owing to the fact of the high resistance R being in 'circuit the current which flows through the meter when the l answering plug is inserted is not sutlicient to cause the meter to register, although of -suflicient strength to cause the tcut-olf relay 'D to operate in the regular way. The operator now inserts the calling plug P .and

.-calls -the subscriber wanted. As soon as the called-for subscriber responds, the operatorl presses the keyvK,v placing a low resistance timekvthe relay H draws up its armature against the contact 18, ythus locking the shunt circuit so that any further manipulation of the key K will not cause thefineter M to register. It is only when the circuit traced'above is broken by the withdrawal ,of

the answering plug from its jack that the armature of the relay H is permitted to tall back, thereby restoring the parts to their normal position. l p

In Figs. 2 and 3 I have made use of indicating'push b utton keys K .and cooperating relays H which may be used in place of the key and the relay shown in Fig. 1. The g'eneral arrangement of the' circuit in Figs. 2 and 3" is practically the same' as that in Fig. 1, with a few changes. In Fig. 2 the 'key K'is heldin a normally elevated position by the spring 23 which engages the lug 2() carried by thekey. The insertionpf the answering plug P permits current to flow through the high resist-ance and through the meter M in the manner previously described. When'the called subscriber answers, the op` erator presses the key K and the spring 23 makes Contact at 18, thus closing theshunt circuit 16, 18 and 1.7 and energizing the relay H. The key K is provided with an armature 7c on its lower end. The closing of the shunt circuit at 18 locksthis arma-v ture o n the end of the relay magnet H, thus preventing the operator from accidentally pressing the key a second time and thus registering a second call in the meter. If, for any reason, the operator does desire to register a second call as, for instance, when a subscriber has lexceeded the time limit allowed F ig'. 2 out provided with locking means'.

which willprevent the operator from registering a second call until the answering plug has been withdrawn from its jack. ,-In this figure the key K is provided with a lug 1204 adapted to bear against a spring 23 to .close the,v shunt circuit at they contact When this is done, the relay H is actuated and its magnet attracts the armature 21. The beveled edge of the lower. end of the key K cooperates with a similar beveled vedge on the armature 21 to pressthe latter slightly away from the relay H when the key descends. 'When in its lowest position the key is retained by-the engagement of the shoulder 22a with a corresponding shoulder on the armature 21a and cannot be raised until the armature is released. The closure of the circuit through the relay H, of course, locks said relay and the latteris only unlocked when the answering plug is withdrawn from the jack.

In` Fig. 4'I 'have yshown av meter circuitv which depends uponA the called subscriber being actually connected before it is possible for the operator to close the meter to'regi'sf ter. This circuit is somewhat similar to that shown in Fig. 1, except that the ywinding of -the relay H has its circuit extended by means l.of the conductor 17 throughv a series contact *24* of the supervisory control relay S. This c'rontact is normally open and is closed only when the called for subscriber has his receiver removed from his hook switch. When the called for subscriber takes down his receiver, thus closing his end of the line, the following circuit is completed: B, 10, S, 10', C, tip side of calling plug, subscribers line circuit, sleeve side of calling plug, 8, 12', S, 12'. The relay S pulls up, establishing contact' at 24a, lthe operatorv presses' key K,

vand current flows through the meter M by the following path: ground side of meter,

Ma 41 D j", pqr 7a E: 15a 16a 19a-H: 171 ga, 14, battery, ground.

vIt will be noted that in the above arrangement as shown in Fig. 4, the operator is only able to complete the circuit afterthe called for subscriber has actuated the relay S,

thereby closing the circuit at 24a, and throwv ing the battery B in the meter circuit. y

Fig. 5 illustrates a meter circuit which depends on both the calling and the called for subscriber being connected before it is possible for the operator to cause the meter to register. The line and cord circuits are the same as shown in Fig. 1 with the excel tion of the 'extra wiring shown in connec tion with the vsupervisory control` relays W land S. These relays IV and S are actuated` whenever the subscribers have taken their receivers off the hook switches by circuits similarto the onetraced in explanation of the action ofthe relay S in 4. These relays having pulled up, the circuit is closed throughthe contacts`24 .and 24a.' The' op-l erator now presses the key K and the` circuit through the meter M iscompleted thus: ground side-of meter,- M, 4,1), jf', p.' a, E, 15, 16, 18, H, 17, 24, 13, 24, 1 7?, G;

Fig. 6 shows an' arrangement similar to 'that shown'inFi'g. 4 but which makes use :tocarte of an indicating key instead of the contact key shown in the latter figure. As in the arrangement of Fig. 4 it is necessary in the arrangement of Fig. 6 for the calledl of this key is the same as that already de-` scribed in connection with Fig. 3.

Fig. 7 shows an arrangement in which it i is necessary that both subscribers remove their receiversfrom the hook switches before it is possible for the operator to cause the meter to register. When both subscrib` ers are connected the operator presses the key K and the circuit is completed through the meter thus: ground side of meter, M, 4, D, 3, j,'p, 7a, E, 15, 16, 18, H, 17, 24a, 13, 2li, B. v

Fig. 8 shows the requisite connections for a polarized meter mechanism which will not operate when the answering plug is inserted in the jack but which is 4'caused to register as soon as the operator presses a meter button which reverses the current through the magnet of the meter and causes the action of the latter. In this ligure the relay M consists of an electromagnet provided with an armature ot permanent polarity adjacent the end thereof. As is Ordinar in meters of this kind, the armature wil be attracted only when an unlike pole is in duced in the adjacent end of the electromagnet. In the ligure the direction of the current has been indicated. When the answering plug is inserted the current through the meter is as follows: ground side of meter, M, 4, D, 3, j, p, 7, E, 15, R, 17, 19a, 26, and B. The operator now presses her key K, breaking the circuit at the point 19l and closing the circuit at the points 19", and 19. The circuit through the meter M I may now be traced from the supplemental battery G, 191, 17, n, is, 16, 15, E, 7a, p", j, 3, D, 4C, M, and ground. This reverses the polarity of the meter magnet and causes the actuation of the meter by the movement of the armature. It will be noted that in this case it i's necessary to use a separate battery so as not to have a ground common 55 with that of the main battery.

In Fig. 9 I have illustrated diagrammatically a meter thermally operated by the expansion and contraction of wire Lla which could be effectively used in place 'of the electromagnetically operated meters shown in Figs. 1 to 7, inclusive. As in the case of the electromagnetically .operated meters the registering of the thermal meter depends upon the fact that when the answering plug is inserted not enough current is permitted to :flow through the wire la to cause it to vary in length sufficiently toregister on account of the high resistance R' interposed between the battery and the meter in the third strand of the operators cord circuit. When, however, the operator presses the meterkey, thus providing a low resistance shunt around the high resistance R, enough current is permitted to flow through the wire et of the thermal device to cause the operation'of the latter and the registering ot' the meter. Moreover, the thermally operated meter can be and preferably is arranged Yand, adjusted for a definite amount oi' current,"thereby operating within. a close range.

Having thus described my invention what I claim and desire to secure by Letters Patent is: Y

1. In a measured service telephone system, subscribers lines, registering meters connected therewith, an operators cord circuit forinterconnecting said lines having calling and answering plugs and provided withv a battery, a high resistance in series with said battery, a normally open 'sltunt circuit around said high resistance, a key for closing said circuit to actuate said meter, and a low resistance locking relay in said shunt circuit adapted to maintain a shunt about said resistance until released byK the with-- drawal of the answering plug,

2. In a measured service telephone system, subscribers `S-wire circuits provided with cut-od relays, call registering meters in 'series with said cut-ott relays, an operators cord circuit for interconnecting said subscribers lines comprising va battery, a high resistance in series with-said battery, a normally open shunt circuit around said high resistance, a` low resistance locking relay in said shunt circuit, a key for closing said shunt circuit to ,actuate said meter, said relay. acting tomaintain said resistance shunted until denergized.

3. In a measured service telephone system, subscribers lines, registering meters connected therewith, an operators cord circuit provided with a supervisory control relay, a high resistance and a battery in series with the winding of said supervisory control relay, a normally open low resistance shunt around said high resistance, means for closing said shunt circuit to operate said meter, .and means for maintaining said shunt circuit closed.

Lt. In a measured service telephone system, subscribers lines, registering meters connected therewith, an operators cord circuit provided with a supervisory control relay, a high resistance and a battery in series with the winding otsaid supervisory control relay, a normally open low resistance shunt around said high resistance, said shunt circuit including a low resistance lockingl rela'y and contact key whereby on the manipulation of s'aid' contact l'ey the shunt circuit will be closed and locked and the meter -being provided on its lowerend with a head having a shoulder adapted to engage the shoulder on said armature whereby on the manipulation of said indicating key the shunt circuit will be' closed and locked and the 'meter actuated by the current from said battery. c

6. In ,a measured service telephone system, subscribersVlines, registering meters connected therewith, an operators cord cir-4 cuit provided with 'a supervisory control re`- lay, a calling supervisory relay, a high resistance and a battery in series with the winding of said supervisory control relay, a normally open low resistance shunt around said high resistance, said shunt including a spring contact, an electro-magnet hav-ing an armature provided'with a shoulder, and a second battery and being completed through the armature of theV calling supervisory relay, and an indicating push key provided.

with a lug and adapted to clos-e said spring contact and having a head provided with a shoulder adapted to engage the shoulder on said armature whereby when said callingsupervisory relay has been energized 'and said indicating key depressed, the shunt circuit is closed and locked and the meter actuated by the current from said second battery.

7 In a measured service telephone system, subscribersA lines', registering meters connected therewith, an operators cord circuit, a key arranged in said cord circuit for controlling the actuation of said meters, a circuit controlled by said key and means for locking the circuit closed by said key, said circuit uninterrupted by said locking means during the operation thereof.

8. In a measuredy telephone system,isub I scribers lines,- registering meters connected trolling .the actuation of.said meters, a key therewith, an operators' cord circuit for conassociated withsaid cord circuit a circuit controlled by said key, and means for locking the circuit closed by said key.

9, In a measured service telephone system, subscribers lines, registering meters connected therewith, an operators cord circuit including a battery, a high resistance in series with said battery, a normally open shunt circuit around saidhigh resistance, a key for closing-said shunt circuit-thereby causing said meter to register, and locking means for holdin said shunt. In testimony 'w ereof I aiix my signature in presence of two Witnesses.

Y RAY H. MANSON.'

Witnesses:

S J. ROBERTS, W.`C. STRONG., 

